Mathematics – Logic
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1679j&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Dec. 1975, p. 1679-1689.
Mathematics
Logic
7
Petrology, Precambrian Period, Radioactive Age Determination, Sedimentary Rocks, Granite, Minnesota, Rubidium Isotopes, Strontium Isotopes
Scientific paper
The Vermilion district in Northeastern Minnesota is a classic example of a lower Precambrian greenstone-granite terrane in the Superior Province of the Canadian Shield. The present study presents new Rb-Sr isotopic data for the Ely Greenstone, the Newton Lake Formation, granitic pebbles that occur within the Ely Greenstone, a graywacke composite of the Knife Lake Group, and some Algoman granites whose data are complementary to those of Peterman et al. (1972). The isochron ages obtained are statistically indistinguishable and therefore cannot be used to resolve the timing of specific geologic events. Volcanic extrusion, granitic intrusion, and metamorphism are shown to be less contemporaneous events which probably took place within a time span of less than 50 m.y. A major conclusion is that a granitic basement probably did not underlie the Ely Greenstone.
Jahn Bor-Ming
Murthy Rama V.
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